package com.wxz.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.wxz.reggie.common.BaseContext;
import com.wxz.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter  implements Filter {
    // 路径匹配器，支持通配符
    public  static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1. 获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求 {}", requestURI);

        //
        String urls[] = new String[] {
               "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**"
        };


        // 2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        // 3. 如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }

        // 4.判断登录状态, 如果已经登录 直接放行

       if(request.getSession().getAttribute("employee") != null) {
           log.info("用户已登录， 用户名为: {}", request.getSession().getAttribute("employee"));


           Long empId = (Long) request.getSession().getAttribute("employee");
           BaseContext.setCurrentId(empId);


//           long id = Thread.currentThread().getId();
//           log.info("线程id 为 {}", id);
           filterChain.doFilter(request, response);
           return;
       }

       log.info("用户未登录");
        // 5. 如果未登录则返回登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }


    /**
     * 路径匹配 检查本次请求是否需要放行
     * @param  urls
     * @param requestURI
     * @return
     */
    public boolean check(String urls[],String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return  true;
            }
        }
        return false;

    }


}
